A 200 N box is pushed up an incline that is 5.00 m long and rises 1.00 m. The incline has a coefficient of kinetic friction of 0.200. The work done by the pushing force is
A. 475 J.
B. 422 J.
C. 356 J.
D. 300 J.
E. 396 J.
E. 396 J.
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The shape of Earth's magnetosphere is modified by
a. the Moon's tidal force. b. the solar wind. c. Earth's own gravity. d. asymmetries in the shape of Earth's core. e. Earth's elliptical orbit.
A compound lens is made by joining the plane surfaces of two thin plano-convex lenses of different glasses. The radius of curvature of each convex surface is 80 cm. The indices of refraction of the two glasses are 1.50 and 1.60
What is the focal length of the compound lens? A) 71 B) 75 C) 67 D) 69 E) 73
Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is ahead of Mike. Which statement is correct about the distances run and the displacements from the origin?
a. Joan has run a greater distance and her displacement is greater than Mike's. b. Mike has run a greater distance and his displacement is greater than Joan's. c. Joan has run a greater distance, but her displacement is less than Mike's. d. Mike has run a greater distance, but his displacement is less than Joan's. e. Mike has run a shorter distance, and his displacement is less than Joan's.
Ice has a latent heat of fusion of 80 kcal/kg. How much heat is required to melt 200 g of ice?
A) 400 J B) 160 J C) 67 kJ D) 32 kJ E) 16 kJ